Docker-map

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* Minor fixes for compatibility with newer Docker hosts.
* Followup fixes from `Issue 15 <https://github.com/merll/docker-map/issues/15>`_.

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* Fixed case where ``exec_create`` does not return anything, as when commands are started immediately (e.g. the CLI,
`Issue 17 <https://github.com/merll/docker-map/issues/17>`_).
* Improved accuracy of comparing the container command from the configuration with the container inspection info.
* Added parser for CLI ``top`` command, as needed for inspecting exec commands.

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* Fixed command line generator for case where ``cmd`` is used as a keyword argument
(`Issue 16 <https://github.com/merll/docker-map/issues/16>`_).

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* Fixed recursive dependency resolution order.
* Setting an alias name is always optional for container links, even if ``ContainerLinks`` tuple is used directly.

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* Added ``version`` method to command line generator.
* Internal refactoring: Moved configuration elements to individual modules. If you get any import errors from this
update, please check if you are using convenience imports such as ``from dockermap.api import ContainerMap`` instead
of the modules where the classes are implemented.
* Fixed ``ContainerMap.containers`` attribute access to work as documented.

.. note::
The default iteration behavior has also changed. Similar to ``ContainerMap.host`` and ``ContainerMap.volumes``, it
generates items. Before iteration was returning keys, as usual for dictionaries.

* Fixes for use of alternative client implementations (e.g. CLI,
`Issue 12 <https://github.com/merll/docker-map/issues/12>`_).
* Fixed ``link`` argument for command line generator (`Issue 13 <https://github.com/merll/docker-map/issues/13>`_).
* Added replacement for invalid characters in generated host names
(`Issue 15 <https://github.com/merll/docker-map/issues/15>`_).

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* Refactoring of policy framework. The monolithic client action functions have been divided into separate
modules for improving maintainability and testing. This also makes it easier to add more functionality.
A few minor issues with updating containers and executing commands were resolved during this change.
* Added an experimental command line generator.